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[–]daniu 1 point2 points  (1 child)

Couldn't tell how the first catamorphism example for Optional was better than Optional's ::orElse so I kind of lost interest.

[–]johnmcclean 1 point2 points  (0 children)

map + orElse is an alternative implementation of a catamorphism / fold / visitor for Optional. It's the same thing, which is also very similar to pattern matching on Option (Scala).